Process for coating steel or iron with copper.



I. 5.- BUMPER. PBocEss POR GoATINGsTBEL 0B IRON WITH COPPER;

lfPLIoATIx FILED 1mm, 1912.

Patented Nov. 3, 1914.y

Llllis'zo,

Attorneys entre sra-r T OFFICE.

PROCESS FOR COATIN G STEEL GR IRON WITH COPPER.

Application filed December 3, 1,912. Serial No. 734,779.

To all 'Lc/1cmy it may com-'em Be it known that l, JAMES E. Snnixrrnn, acitizen .of the United States, residing at Burnham, in the county ofMilin and State of Pennsylvania, have invented a new and useful rocessfor Coating Steel or I ron with Copper, .ot' 'which the following is aspecification.

The present invention appertains to a process of producing a coatedmalleable and ductile ingot for the manufacture of rolled or drawnpaxoducts, and aims to provide a novel and improved process :torproducing an ingot of the nature indicated, which may be .drawn orrolled into plates, sheets, fire or other products, having a relativelyhigh `tensile and com )ressive strength and having a coating or facingof non-corrodible and good electricity-conducting material. l ln orderto clearly illustrate the .formation of the products of the presentprocess, attention is invited to the accompanying drawings, in which*Figure l is a vertical central sectional view through an ingot mold forthe casing of an ingot, rectangular in cross section, and showing thecompletion of the first steps of the process. Fig. 2 is a top plan viewthereof.- Fig. 3 is a side elevation of a completed sguare ingot. Fig. 4is a cross section through the square ingot. Fig. 5 1s a view similar toFig. l showing a cylindrical ingot mold. Fig. 6 is a top plan viewthereof. Figs. 7 and 8 illustrate in side elevation and cross section,respectively, a completed cylindrical ingot.

In carrying out the present process, there is provided an ingot mold l,which may be of square or rectangular cross section, as illustrated inFigs. l and 2, or which may be circular in cross section, as seen inFigs. 5 and (5. The lirst sten of the process resides in filling themold l With molten copper. which is a malleable and ductile metal'having relatively high eoetlicients of eXpansion and thermalconductivity', and a relatively lovv melting point. The next step of theprocess resides in permitting the superlicial portion of the copper tocool and solidify to form a hollow shell 2 Within the mold, as seen inFigs. 1, 2, 5 and 6, the interior molten metal then being drawn from theshell 2 previously formed. The shell 2 is then lled with a core-formingmolten malleable and ductile metal, either steel or iron, which has arelatively loW coeficient of Specification of Letters Patent.

' the mold ,and the Patented Nov. 3, 1914.

expansion and a relatively high melting point. Thus, the molten steel oriron Will slightly fuse the interior of the shell 2, in order that the.two metals will inter-penetrate and Weld together. This is due to thefact that the melting point of the coreforming metal is considerablyhigher than the melting point of the shell forming metal or .the copper,core-forming metal is introduced into the shell, the interior of theshell will be raised to the melting point, due to its direct engagementwith the core-forming metal. The exterior of the shell being in contactwith copper having a high coelicient` of thermal conductivity, Willprevent the entire shell from fusing.

The final step consists in permitting the tivo metals to cool, the shelldissipating the heat to the surrounding media, or to the mold and thenceto the surrounding media. Due to the fact that the copper has arelatively high coeiicient of expansion, While the core metal has arelatively loW coefficient of expansion, the. shell and core in coolingsimultaneously, will cause the shell 2 to have a greater contractiveeffort than the core 3, whereby the bonding of the shell and core willbe made more complete and effective as the core metal and interior ofthe shell solidify. The shell having a relatively high coefficient ofthermal conductivity, will quickly dissipate the heat to the surroundingmedia, to enhance the cooling of the ingot.

Due to the fact that the two metals are each malleable and ductile, theingot may be rolled or hammered into sheets, plates, bars and the like,or may be drawn out into Wires, rods, and the like, it being noted, thatin each case, the product comprises a body o'f steel or iron, which iscoated With copper. Thus, the body of the product will have a highdegree of tenacity, and Will withstand considerable tensile andcompressive strains, vvhile the coating or facing Will render theproduct non-corrosive, and an 'electrical conductor of high order.

From the foregoing, it is manifest that the selection of metals havingthe properties above noted, is essential to the process resulting in themalleable and ductile ingot for the manufacture of rolled or drawnproducts. i

What is claimed is:

l. The process fof producing a coated/ whereby When the molten malleableand ductile ingot for the manufacture of rolled or drawn products,consisting in filling a mold with a molten malleable and ductile metalhaving relatively high coefficients of expansion and thermalconductivity, and a relatively low melting point, their permitting thesuperficial portion of the metal to cool and solidify to form a hollonTshell, then drawing off the interior molten metal from the shell, thenfilling the shell with a core-forming molten malleable and ductile metalhaving a relatively low coefficient of expansion and a relatively highmelting point, to slightly fuse the interior of the shell whereby thetwo metalsy interpenetrate and weld together, and thenA permitting thetwo metals to cool, the shell dissipating the heat to the surroundingmedia and having a greater contractive effort than the core.

2. The process of producing a coppercoated malleable and lductile steelor iron ingot, for the manufacture of rolled or drawn products,consisting in lling a mold with molten copper, then permitting thesuperficial portion of the copper to cool and solidify to form a hollowlshell, then drawing off the interior molten copper from the shell, thenfilling the'shell With core-forming molten malleable and ductile steelor iron, to slightly fuse the interior of the shell, whereby the twometals interpenetrate and weld together, and then permitting the tvvometals to cool, the shell dissipating the heat to the surrounding mediaand having a greater contractive effort than the core.

In testimony that I claim the foregoing as my own, I have hereto affixedmy signature 1n presence of two Witnesses.

J AMES E. SHEAFFER.

